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A serial killer attacking primary school students is at large - and five victims cause even the president to be involved in the investigation. When the most likely suspect dies in police custody and the case appears to be in a dead end, the senior police officers decide to create a killer - and anyone will do it. Although Inspector Choi Cheol Gi boasted of having made an incredible number of arrests during his career, his rank never showed that. He was trapped and demoted for another crime and decides that this is his last chance of professional redemption. He made an agreement with the chief of the Mafia Jang Seok Gu, on which he was investigating, and together they decided to make one of the existing suspects look like the serial killer. The only obstacle to their plan is Prosecutor Ju Yang, who takes charge of the case.Ju himself was involved in a case with the head of a rival criminal organization. Ju himself was involved in an agreement with the boss of a rival criminal organisation, and President Kim wants Choi to be removed from office. When secret transactions and clandestine agreements start to be revealed, Choi, Ju, Jang and Kim are sinking deeper and deeper into a black hole of questionable ethics and abuse of law. He's making an agreement with Mafia leader Jang Seok Gu, on which he was investigating, and they're together deciding to put one of the existing suspects into the serial killer. Leseul obstructs their plan is Prosecutor Ju Yang, who takes over the case. Ju Yang was himself involved in an agreement with the head of a rival criminal organization, and President Kim wants Choi to be removed from office. When secret transactions and clandestine agreements start to be revealed, Choi, Ju, Jang and Kim are increasingly sinking into a dark hole of questionable ethics and abuse of law.